ZQ is a Poor Metric for Sleep Quality. Is there way to include an alternative?
Hello, everyone - I recently purchased my first Zeo, and am enjoying it very much. In a way, it's gotten me back into being interested in my sleep, and how to improve it. So, thank you to both the people at Zeo, and the community that's forming here. I really like it. :)
That said, after working with the Zeo for the last week or so, I find myself bumping up against a wall in terms of how the data is parsed by the Zeo website, and I wanted to get a sense if anyone else in the community has similar issues. I purchased the Zeo looking for an objective (or somewhat objective, at least) measure of my sleep quality. The ZQ score serves at first as a sort of "baseline", but it really doesn't measure sleep quality.
My specific concern is that there really is no "sleep quality" score. The ZQ (Z Quality?) just tells you how long you've slept. I can produce the same data by just tracking when I go to bed and when I wake up. In fact, after spending a week with the Zeo, what the ZQ score has told me is that if I want to feel more rested, I need to get more sleep. That's probably pretty good advise, but not something I needed a cool tool for measureing sleep cycles to tell me. :)
In fact, if you look at the ZQ score vs. Total Z in Trending, they're so close to each other to be the same measure, as you can see in the screenshots comparing the trending between the two.
I'm hungering after a single score that is ratio based that I can use to judge how my Sleep Quality is reacting to the things I throw at it. At the moment, all ZQ will tell me is whether or not, for example, exercising early in the day increases the amount of time I allocate to sleep afterwards.
I'd like to propose two possible additions that would be wonderful. The first easy suggestion is that I'd love in Trends to be able to see changes in the percentages over time. For example, on a day-to-day basis, I'm able to see that I was 17% in deep, and 18% in REM, or whatnot. However, I can't see how these change over time. If these could be added to the Trending options, that would be a huge step forward for me. This way, I could see that exercising - on an hour per hour basis - seemed to generally increase the proportional amount of time I spent night-after-night in a "restorative sleep".
What I would prefer even more is if the "custom variables" allowed you to create your own, by saying, "Track % in deep + % in REM". For example, I use an alternative ZQ score when I download the CSV files which I call RZ (Restorative Z), which is generally that I take:
((minutes in REM + minutes in Deep)/(minutes awake + minutes in REM + minutes in Deep + minutes in Light))
This gives me a combined measure how many "minutes per minute sleeping" were spent in the two stages that I consider the most critical. (I don't discount the value of light sleep, but I have sleep apnea, and my assumption is that the apnea events are keeping me in the light sleep, and preventing me from reaching the other two as frequently as I like). Part of my curiosity is to see if this holds true as it relates to my general feel in the morning.
I'm also getting a sleep apnea device in the next few weeks; I'm looking forward to seeing if this influences the amount of time I spend in each stage per hour slept, as well.
I can imagine that adding the "custom" ratio forms in trending would be a pain, but does anyone else in the community see a value to an additional metric sort of like Restorative Z, that lets you measure sleep quality instead of time slept? At the moment, I'm hungering for a metric I can use to help improve the quality of every hour slept, not just the total amount of it.
Curious to hear if that would be useful for people, or if I'm just an odd duck (in which case, I happily continue to use excel to do that same thing with the CSV files).